Artigo

Very high productivity of the C4 aquatic grass Echinochloa polystachya in the Amazon floodplain confirmed by net ecosystem CO2 flux measurements

Fluxes of CO2 and H2O vapour from dense stands of the C4 emergent macrophyte grass Echinochloa polystachya were measured by eddy covariance in both the low water (LW) and high water (HW, flooded) phases of the annual Amazon river cycle at Manaus, Brazil. Typical clear-sky midday CO2 uptake rates by...

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Autor principal: Morison, James I.L.
Outros Autores: Piedade, Maria Teresa Fernandez, Müller, Ewald K.H., Long, Stephen Patrick, Junk, Wolfgang Johannes, Jones, Michael B.
Grau: Artigo
Idioma: English
Publicado em: Oecologia 2020
Assuntos:
Aquatic Plant
C4 Plant
Carbon Dioxide
Carbon Flux
Primary Production
Amazonas State
Brasil
Manaus
Echinochloa Polystachya
Acesso em linha: https://repositorio.inpa.gov.br/handle/1/19189
id oai:repositorio:1-19189
recordtype dspace
spelling oai:repositorio:1-19189 Very high productivity of the C4 aquatic grass Echinochloa polystachya in the Amazon floodplain confirmed by net ecosystem CO2 flux measurements Morison, James I.L. Piedade, Maria Teresa Fernandez Müller, Ewald K.H. Long, Stephen Patrick Junk, Wolfgang Johannes Jones, Michael B. Aquatic Plant C4 Plant Carbon Dioxide Carbon Flux Primary Production Amazonas State Brasil Manaus Echinochloa Polystachya Fluxes of CO2 and H2O vapour from dense stands of the C4 emergent macrophyte grass Echinochloa polystachya were measured by eddy covariance in both the low water (LW) and high water (HW, flooded) phases of the annual Amazon river cycle at Manaus, Brazil. Typical clear-sky midday CO2 uptake rates by the vegetation stand (including detritus, sediment or water surface) were 30 and 35 μmol CO2 (ground) m-2 s-1 in the LW and HW periods, respectively. A rectangular hyperbola model fitted the responses of 'instantaneous' (20- or 30-min average) net CO2 exchange rates to incident photosynthetic photon flux densities (PFD) well. Stand evaporation rates were linearly related to PFD. The major difference in CO2 uptake rates between the two periods was the larger respiration flux during LW due to the CO2 efflux from sediment, roots and litter. Integrated 20- or 30-min fluxes were used to derive relationships between daily CO2 and H2O vapour fluxes and incident radiation. The daily CO2 fluxes were almost linearly related to incident radiation, but there was evidence of saturation at the highest daily radiation totals. Annual productivity estimated from the daily model in 1996-1997 agreed closely with that previously estimated for 1985-1986 from a leaf-scale photosynthetic model, but were some 15% less than those derived at that time from biomass harvests. Both CO2 uptake and water use efficiency were comparable with those found in fertilized maize fields in warm temperate conditions. 2020-06-15T22:06:09Z 2020-06-15T22:06:09Z 2000 Artigo https://repositorio.inpa.gov.br/handle/1/19189 10.1007/s004420000464 en Volume 125, Número 3, Pags. 400-411 Restrito Oecologia
institution Instituto Nacional de Pesquisas da Amazônia - Repositório Institucional
collection INPA-RI
language English
topic Aquatic Plant
C4 Plant
Carbon Dioxide
Carbon Flux
Primary Production
Amazonas State
Brasil
Manaus
Echinochloa Polystachya
spellingShingle Aquatic Plant
C4 Plant
Carbon Dioxide
Carbon Flux
Primary Production
Amazonas State
Brasil
Manaus
Echinochloa Polystachya
Morison, James I.L.
Very high productivity of the C4 aquatic grass Echinochloa polystachya in the Amazon floodplain confirmed by net ecosystem CO2 flux measurements
topic_facet Aquatic Plant
C4 Plant
Carbon Dioxide
Carbon Flux
Primary Production
Amazonas State
Brasil
Manaus
Echinochloa Polystachya
description Fluxes of CO2 and H2O vapour from dense stands of the C4 emergent macrophyte grass Echinochloa polystachya were measured by eddy covariance in both the low water (LW) and high water (HW, flooded) phases of the annual Amazon river cycle at Manaus, Brazil. Typical clear-sky midday CO2 uptake rates by the vegetation stand (including detritus, sediment or water surface) were 30 and 35 μmol CO2 (ground) m-2 s-1 in the LW and HW periods, respectively. A rectangular hyperbola model fitted the responses of 'instantaneous' (20- or 30-min average) net CO2 exchange rates to incident photosynthetic photon flux densities (PFD) well. Stand evaporation rates were linearly related to PFD. The major difference in CO2 uptake rates between the two periods was the larger respiration flux during LW due to the CO2 efflux from sediment, roots and litter. Integrated 20- or 30-min fluxes were used to derive relationships between daily CO2 and H2O vapour fluxes and incident radiation. The daily CO2 fluxes were almost linearly related to incident radiation, but there was evidence of saturation at the highest daily radiation totals. Annual productivity estimated from the daily model in 1996-1997 agreed closely with that previously estimated for 1985-1986 from a leaf-scale photosynthetic model, but were some 15% less than those derived at that time from biomass harvests. Both CO2 uptake and water use efficiency were comparable with those found in fertilized maize fields in warm temperate conditions.
format Artigo
author Morison, James I.L.
author2 Piedade, Maria Teresa Fernandez
Müller, Ewald K.H.
Long, Stephen Patrick
Junk, Wolfgang Johannes
Jones, Michael B.
author2Str Piedade, Maria Teresa Fernandez
Müller, Ewald K.H.
Long, Stephen Patrick
Junk, Wolfgang Johannes
Jones, Michael B.
title Very high productivity of the C4 aquatic grass Echinochloa polystachya in the Amazon floodplain confirmed by net ecosystem CO2 flux measurements
title_short Very high productivity of the C4 aquatic grass Echinochloa polystachya in the Amazon floodplain confirmed by net ecosystem CO2 flux measurements
title_full Very high productivity of the C4 aquatic grass Echinochloa polystachya in the Amazon floodplain confirmed by net ecosystem CO2 flux measurements
title_fullStr Very high productivity of the C4 aquatic grass Echinochloa polystachya in the Amazon floodplain confirmed by net ecosystem CO2 flux measurements
title_full_unstemmed Very high productivity of the C4 aquatic grass Echinochloa polystachya in the Amazon floodplain confirmed by net ecosystem CO2 flux measurements
title_sort very high productivity of the c4 aquatic grass echinochloa polystachya in the amazon floodplain confirmed by net ecosystem co2 flux measurements
publisher Oecologia
publishDate 2020
url https://repositorio.inpa.gov.br/handle/1/19189
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score 11.755432

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